Enum LeadingSpec 

pub enum LeadingSpec {
    None,
    Fixed(u32),
    Proportional(u32),
}

How leading (inter-line spacing) is specified.

Variants

None

No extra leading — lines are packed at cell height.

Fixed(u32)

Fixed leading in sub-pixel units (1/256 px) added between lines.

Proportional(u32)

Leading as a fraction of line height (256 = 100% = double spacing).

Common values:

• 0 = single spacing (no extra)
• 51 ≈ 20% extra (1.2x line height, CSS default for body text)
• 128 = 50% extra (1.5x line height)
• 256 = 100% extra (double spacing)

Implementations

impl LeadingSpec

pub const CSS_DEFAULT: Self

CSS-style 1.2x line height (20% extra leading).

pub const ONE_HALF: Self

1.5x line height.

pub const DOUBLE: Self

Double spacing.

pub fn resolve(&self, line_height_subpx: u32) -> u32

Compute the actual leading in sub-pixel units for a given line height.

Trait Implementations

impl Clone for LeadingSpec

fn clone(&self) -> LeadingSpec

Returns a duplicate of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for LeadingSpec

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Default for LeadingSpec

fn default() -> LeadingSpec

Returns the “default value” for a type.

impl Display for LeadingSpec

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Hash for LeadingSpec

fn hash<__H: Hasher>(&self, state: &mut __H)

Feeds this value into the given Hasher.

fn hash_slice<H>(data: &[Self], state: &mut H)

where H: Hasher, Self: Sized,

Feeds a slice of this type into the given Hasher.

impl PartialEq for LeadingSpec

fn eq(&self, other: &LeadingSpec) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Copy for LeadingSpec

impl Eq for LeadingSpec

impl StructuralPartialEq for LeadingSpec